A kind of preparation method of lithium-rich anode sheet of lithium ion battery

Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a lithium-rich anode sheet of a lithium ion battery, comprising the following steps: coating the anode slurry on an anode current collector, drying, and preparing an anode membrane comprising an anode The anode sheet to be replenished with lithium; the anode sheet to be replenished with lithium is infiltrated with the electrolyte, and after the anode diaphragm is fully infiltrated, the anode diaphragm is in contact with the metal lithium dual channel to obtain a lithium-rich anode sheet, wherein the contact temperature is 10~150℃, pressure less than 100MPa, time less than 10h. Compared with the prior art, ion channels and electron channels are simultaneously formed between the metal lithium and the anode diaphragm in the present invention, and the potential difference between the anode material and the metal lithium can promote the rapid ionization of the metal lithium to form lithium ions, which are transported through the electrolyte Embedded in the inside of the anode active material particles, and finally achieve the purpose of rapid lithium replenishment. In addition, the process of the invention is simple, and it is very easy to realize industrialized mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium-rich anode sheet of a lithium ion battery. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes to the field of lithium-ion batteries. Since then, lithium-ion battery technology has developed rapidly and is used in mobile phones, video cameras, laptop computers and other portable appliances. Lithium-ion batteries have many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, etc. It is an ideal power source for mobile appliances and electric vehicles in the 21st century. Power supply and electric storage for storage power station. [0003] However, with the continuous development of min...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: address the deficiencies of the prior art, and provide a method for preparing a lithium-rich anode sheet for a lithium-ion battery that has simple process, low cost, and can effectively control the amount and uniformity of lithium supplementation to the anode sheet , using this method can effectively improve the first Coulombic efficiency of the battery cell, thereby greatly improving the energy density of the battery cell, and at the same time can ensure the safety performance and cycle performance of the battery, so as to overcome the disadvantages of the lithium supplementation method in the prior art. Complicated, high cost, unable to effectively control the amount of lithium supplementation, insufficient safety, and may lead to poor cycle performance of the battery